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===About Reactivity===
: [[Reactivity]] is determined by how easily an [[element]] can lose or gain [[electron]]s.
: [[Electron]]s are held in [[orbit]] around the [[Atomic Nucleus|nucleus]] because the [[electron]]s are [[Negative Charge|negatively charged]] and are attracted to the [[Atomic Nucleus|nucleus]] which is [[Positive Charge|positively charged]].
: If an [[element]] loses [[electron]]s easily it is highly '''reactive'''.
: If an [[element]] gains [[electron]]s readily it is also highly '''reactive'''.
Three important factors affect [[reactivity]] of [[element]]s.
*The [[charge]] of the [[Atomic Nucleus|nucleus]]
*The shielding effect of inner [[electron]]s.
*Distance between the [[Atomic Nucleus|nucleus]] and the [[Outer Shell|outer shell]].